R22 refrigerant explained: what it means for your aircon

R22 was the standard aircon refrigerant for decades before R410A and R32 arrived. It belongs to a chemical family known as HCFCs. The detail that decided its future is the chlorine in it.

Chlorine is what put R22 on the phase-out list. R22 that escapes a system drifts upward over time. High in the atmosphere, sunlight breaks the molecule apart and frees the chlorine. Free chlorine destroys ozone, and ozone at that height is what blocks a large share of the ultraviolet light reaching the ground. One escaped molecule can break apart a great many ozone molecules before it is finished. That chain is what put R22 on the list.

The Montreal Protocol is the treaty that acts on it. Almost every country in the world has signed. The mechanism is worth understanding, because it is often described wrongly. Each country agrees to cap how much of the substance it produces or imports, then cut that ceiling in steps until it reaches zero.

The target is new supply, not installed equipment. Nothing in the treaty switches off a machine that already holds the gas. There is no rule requiring an owner to surrender a working unit. A phase-down works by making the substance progressively harder to buy, and by letting the installed base age out at its own pace.

That is why an R22 system is a supply question rather than a legal one. The gas sitting in your unit is not the thing being withdrawn. The refill that would replace it is.

Supply narrows and cost rises. That is the practical effect in full, and it moves in one direction only. A production phase-down has no reverse gear, so the position for R22 gets tighter rather than easier.

Servicing an R22 system is neither illegal nor impossible. Contractors still handle these units. Gas recovered from decommissioned systems gets cleaned and put back into circulation, which keeps a working market alive. Every recharge, though, draws from a pool that is no longer being topped up at the old rate.

The function of the system does not change. Only the economics around it do. An R22 unit that never needs gas is untouched by any of this. It runs, it cools, and the charge inside it stays exactly where it is. The phase-down only reaches an owner at the moment the circuit has to be refilled.

The current local position is worth asking about rather than reading about. Import rules and stock levels move on their own schedule, and a published figure goes stale quickly. A technician who buys refrigerant knows what R22 costs to source right now and how quickly it arrives. Take the supply picture from the person handling the supply.

One habit is worth naming here. R22 is a single compound rather than a blend, so a leaking system can be topped up without recovering whatever is left inside it. That makes a refill the path of least resistance on an old unit. It is why some R22 systems get gassed over and over while the opening that lost the gas stays exactly where it was.

The nameplate answers it. Every outdoor unit carries a rating label with the refrigerant type printed on it, usually next to the factory charge weight. Reading that label ends the question in one glance.

The label sits on the side or the back of the outdoor casing, often under a layer of dust and grime. Wipe it and look for a line reading REFRIGERANT, followed by R22, R-22 or HCFC-22. Indoor units carry a smaller version of the same label, on a side panel or behind the front cover.

Installation age is a hint, not an answer. R22 belonged to an earlier generation of equipment, so older systems are the ones likely to carry it. A property can still surprise you. An outdoor unit swapped out later, or a mixed set built up over several jobs, puts a different gas on a system that looks original. The label on the actual unit beats any assumption about the building.

There is a second tell, and a technician sees it before the label does. Service port fittings changed size between the R22 generation and the R32 generation of equipment. Gauges made for one will not connect to the other. That difference was designed in deliberately, to stop the wrong gas going into the wrong system.

If someone tells you the system is R22 without having read a label, ask which unit they read. This is a one-glance check that costs nothing. A recommendation resting on the refrigerant type should rest on something a person actually looked at.

R32 cannot be put into an R22 system. This is not a matter of preference, cost or contractor willingness. Three separate things block it, and any one of them is enough on its own.

The oils are different. R22 compressors run on mineral oil. R32 and R410A run on a synthetic ester oil, because mineral oil will not mix with them and will not travel back to the compressor. Oil that fails to return does not vanish. It settles in the coil, where it also insulates the surface that is supposed to be moving heat. The compressor then runs short of the lubricant it depends on. That is a compressor failure with a delay on it, not an immediate one, which is what makes the mistake hard to trace later.

The pressures are different. R32 works at a markedly higher pressure than R22 across the whole cycle. Pipework, flare joints, service valves and coils on an R22 system were specified against the lower figure. Old copper that has already been flared, disturbed and vibrated for a long service life is being asked to hold something it was never rated for. It may hold. It may also let go at the joint that was closest to the limit.

The parts are matched to the gas. Compressor displacement, the expansion device and the way the coil is circuited are all chosen for one refrigerant. Change the gas and the capacity, the discharge temperature and the pressure balance all move with it. The system stops behaving like the system it was designed to be, even where nothing fails outright.

Put those together and a changeover is a replacement. Compressor, coils, and in practice the pipework as well. Once that list is priced, there is no gas swap left inside it. What is actually being bought is a new system, so it should be compared against new systems rather than against the cost of a refill.

The dividing line is whether the fault opens the sealed circuit. That one question sorts nearly every R22 repair decision, and it is far more useful than the age of the unit.

Most aircon faults leave the refrigerant alone. A failed capacitor, a burnt contactor, a fan motor, a control board, a thermistor, a blocked drain, a seized blower wheel. None of these require the circuit to be opened. The charge stays where it is, no gas is bought, and the phase-down has no bearing on the job whatsoever. Repairing any of them on an R22 system is the same decision it would be on a new one.

A smaller group of faults does open the circuit. A leak, a corroded coil, a failed compressor. Now refrigerant has to be recovered and replaced, and the job leans on a supply that is only getting tighter. A compressor burnout is the worst of them, because the debris and acid left behind contaminate the whole circuit and the cleanup becomes part of the price.

Even then, one leak is not a verdict. A single opening at a flare joint, on a system with no other history, is still a repair. The joint gets remade, the circuit gets pressure-tested and evacuated properly, and the charge goes back. What tips the decision is repetition and spread. A second loss on the same system says the pipework is the problem rather than the joint. Corrosion across the coil fins rather than at one point says the next leak is already forming somewhere you have not looked yet.

R22 is the easiest word in this trade to lean on when recommending a replacement. It is true, it sounds final, and it happens to support the more expensive option. That combination is exactly why it deserves a question rather than a nod. Ask which category the fault falls into. If the answer is that the fault never touches the refrigerant, the phase-down is not a reason to replace anything.

Running a healthy R22 system is not a problem waiting to be solved. The gas inside it is going nowhere while the circuit holds, and nothing improves by replacing a unit that still cools well. The decision belongs at the moment the circuit opens, and not a day before.